The ordered mesoporous carbon nitride-graphene aerogel nanocomposite for high-performance supercapacitors

Electrochemical Performance of N-Doped Carbon-Based Electrodes for Supercapacitors

“…Supercapacitors rely on two types of capacitance for charge storage: electrical double-layer capacitance (EDLC) and pseudocapacitance. , Carbon derivatives (carbon nanotubes, activated carbon, and graphene) are promising candidates for electrodes in EDLC-based supercapacitors, which is characterized as a non-Faradaic process that makes use of the charge separation at interfaces between electrodes and electrolytes (by the formation of the Helmholtz layer), thereby making a high surface area necessary to separate charges. Among the carbonaceous materials, graphene appears as a potential candidate, with good electrical conductivity and chemical and mechanical stability. − Different strategies have been conducted in graphene-based materials to reach outstanding performance in energy storage devices, such as from association with carbon nitride aerogel, nitrogen-doping procedures, , and the integration of biobased carbon aerogels with graphene dots …”

“…Among the carbonaceous materials, graphene appears as a potential candidate, with good electrical conductivity and chemical and mechanical stability. 13−15 Different strategies have been conducted in graphene-based materials to reach outstanding performance in energy storage devices, 16 such as from association with carbon nitride aerogel, 17 nitrogen-doping procedures, 18,19 and the integration of biobased carbon aerogels 20 with graphene dots. 21 Pseudocapacitance-based capacitors (usually made of metal oxide or conducting polymers) 12,22,23 can reach outstanding performance in terms of energy density compared with EDLC because energy can be stored within the bulk of the electrode as well as at the surface.…”

Soybean protein-derived N, O co-doped porous carbon sheets for supercapacitor applications

“…The CV curve of NC-3 tends to gradually deteriorate from a rectangular-like shape for 100 mV s −1 to a spindle shape at 300 mV s −1 , indicating that the internal resistance of NC-3 begins to increase with further increasing the sweep rate. 43 Fig. 4c illustrates the GCD curves of different samples at a current density of 0.5 A g −1 .…”

A Supercapacitor with High Specific Volumetric Capacitance Produced by 12-Phosphomolybdate Anchored on Graphene Balls

“…As we all know, 3D graphene could reduce the hardness of the graphene sheet and increase its permeability, thus inhibiting its restacking and allowing electrolyte ions to enter the surface of the electrode material easily and quickly . To date, the 3D graphene foam and aerogel have been proven to improve the specific capacitance. − However, the limited nanoscale compressive force and the large interlayer spacing led to low packing density (∼0.71 g cm –3 ), which limits the specific energy and power density . By comparison, the crumpled 3D graphene balls (CGBs) possess higher packing density (1.28–1.37 g cm –3 ), thus greatly increasing the relevant volumetric capacitance to 321–330 F cm –3 at the current densities of 0.4–83A cm –3 …”